TY - GEN
T1 - Liquid-crystal-based optical time-delay control system for wideband phased arrays
AU - Riza, Nabeel A.
PY - 1993
Y1 - 1993
N2 - We introduce a novel, time delay-based, transmit-receive mode, remotely located, optical control system for wide instantaneous bandwidth phased arrays. Time delays are achieved using a cascade of free-space and fiber-based optical delay lines using bulk imaging optics for low complexity, two dimensional, free-space optical interconnects. High channel isolation, low insertion loss optical switching between delayed and undelayed paths is based on polarization switching using the low cost nematic liquid crystal arrays and polarizing beam splitters. The system allows for noise reduction via spatial and polarization filtering. A dual- channel time-multiplexed system arrangement is used to implement the fast (e.g., 200 beams/s) radar scan rates using the several millisecond response time nematic liquid crystals.
AB - We introduce a novel, time delay-based, transmit-receive mode, remotely located, optical control system for wide instantaneous bandwidth phased arrays. Time delays are achieved using a cascade of free-space and fiber-based optical delay lines using bulk imaging optics for low complexity, two dimensional, free-space optical interconnects. High channel isolation, low insertion loss optical switching between delayed and undelayed paths is based on polarization switching using the low cost nematic liquid crystal arrays and polarizing beam splitters. The system allows for noise reduction via spatial and polarization filtering. A dual- channel time-multiplexed system arrangement is used to implement the fast (e.g., 200 beams/s) radar scan rates using the several millisecond response time nematic liquid crystals.
UR - https://www.scopus.com/pages/publications/0027168082
U2 - 10.1117/12.141715
DO - 10.1117/12.141715
M3 - Conference proceeding
AN - SCOPUS:0027168082
SN - 0819409693
SN - 9780819409690
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 171
EP - 183
BT - Proceedings of SPIE - The International Society for Optical Engineering
PB - Publ by Int Soc for Optical Engineering
T2 - Analog Photonics
Y2 - 10 September 1992 through 11 September 1992
ER -